Blue collar jobs are often hard and tough. They have their influence on both phyical and mental personality of workers doing them. That certainly influences the type of vocal characteristics associated with such jobs. Having a vocal talent replicate a blue collar voice certainly has its purpose in place in almost all job-related voice recordings.
According to Inestopedia,the term "blue-collar" refers to a type of employment. Blue-collar jobs are typically classified as involving manual labor and compensation by an hourly wage. Some fields that fall into this category include construction, manufacturing, maintenance, and mining. Associating vocal characteristics of blue collar workers can serve a dual purpose. One is to relate to all those who hold such a job and the other to explain their situation to a wider audience.
Blue collar workers themselves are essentially the first type of an audience that can relate to a blue collar voice recording. It can explain their daily routine and possible problems, but also their personal aspirations and those as a group. On the other hand it can also be directed to their employers, union officials, as well as a more general public that needs to be informed both about their problems and aspirations alike.
A blue collar voice is usually associated with a 'weathered voice,' one that is influenced by the daily working conditions. The first asociation would be a voice a bit lower in tone, sometimes even gruff. Still, at the same time, it is a voice which is honest, sincere and friendly, particularly when it addresses his fellow workers.